THELIGONUM, in botany: A genus of plants belonging to the class of monocotyledons, and order of polyandria; and in the natural system ranging under the 33d order, Scabrida. The male calyx is bisid; there is no corolla; the stamens are generally 12. The female calyx is also bisid; there is no corolla; only one pistil; the capsule is coriaceous, unilocular, and monospermous. There is only one species, the Cynocrantherus, which is indigenous in the south of Europe.